Meanwhile, in 12-inch skillet, heat oil over medium-high heat. Cook mushrooms in oil 8 to 10 minutes or until lightly browned and liquid has evaporated; stir in 1/2 teaspoon of the salt. Remove from heat; keep warm.

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In blender, place half of the onion-broth mixture. Cover; blend on medium speed 2 minutes or until smooth. Pour into large bowl. Repeat with remaining mixture. Return pureed mixture to Dutch oven. Stir in remaining 1 cup broth and the whipping cream; heat to boiling. Remove from heat; stir in sherry, lemon juice, pepper and remaining 1/4 teaspoon salt. Top with mushrooms.